In the fourth installment of my "Next to drop out" poll, I'm asking this inevitable question: Which Democratic presidential candidate will be next to drop out? We've heard that Clark and Edwards will tough it out past this week and Dean will hang on even if he loses in Wisconsin on Feb. 17. Will Kucinich or Sharpton finally give up the ghost? Let me know what you think! (BTW, for what it's worth, the previous three polls I've taken were accurate.)